In eukaryotes, the nucleus is enclosed by a double membrane called the:
A) cell membrane.
B) nuclear envelope.
C) nucleolus.
D) nucleoplasm.
E) nucleosome.
Ans: B) nuclear envelope.
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Stomatal pores function to allow which of the following?
A. loss of water vapor from leaves B. entry of CO2 into leaves C. prevention of water loss from leaves D. escape of O2 from leaves E. All of the choices are correct
The layer of the heart wall that is the visceral pericardium is also called the
A. endocardium. B. myocardium. C. epicardium. D. chordae tendineae. E. mediastinum
Crossing a true-breeding red-flowered snapdragon with a true-breeding white-flowered snapdragon produces all pink snapdragons in the F1 generation. If F1 individuals are crossed, what will be the ratio of phenotypes in the F2 generation?
A) 2 red:1 pink: 2 white B) 1 red: 2 pink: 1 white C) 3 pink: 1 white D) 1 red:1 pink: 2 white E) 3 white: 1 pink
Microbial ________ is an increase in cell constituents that may or may not be accompanied by an increase in cell number.
Fill in the blank(s) with the appropriate word(s).